Triangles
Formulas and Fun!
Circles
100
If I have an equilateral triangle, what does each angle equal?

60 Degrees

100

What does congruent mean?

the same! 

100

What is the radius?

Half the diameter

200

What does the little square in a shape mean?

90 Degrees

200

If the diameter of a circle is in inches, how would you properly label both the circumference and area?

C = in

A =in2

200

If I have a circle with the radius of 6cm, what is it's circumference?

Draw a picture and label for full credit! 

C=37.68 in

300

Solve for x: 



60

300

What does Pi equal?

3.14159......  We just use 3.14! 

300

If I have a circle with a diameter of 14 in, what is it's area?

A=153.86 in2

400

Solve for x:


x=10 

400

What is the area formula of a circle?

A = (Pi)r2

400

If I am building a fence around my pool, and my pool is 20 feet across, how much fencing do I need?

To get full points, please draw a picture, answer correctly and write which key words tell you what formula to use. 

Circumference!  (Fencing around!!)


C=62.80ft

500

How many degrees are in a triangle?

180

500

What are BOTH circumference formulas for a circle? 

C = (pi)d

C = 2(pi)d

500

Ms Romano wants to get a new rug for her classroom. She knows she has a spot that is 16 feet across that will fit the whole rug. How many square feet will the rug be? 

Key words! Picture! Label! 

A=200.96 in2
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